Huawei Ascend G700-U20 - Manual (Page 89)

Settings
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If you incorrectly enter the PIN a specified number of consecutive times,
the PIN is blocked and the phone prompts you to enter the PIN
unblocking key (PUK). If you incorrectly enter the PUK a specified
number of consecutive times, the SIM card will be disabled permanently.
For details about the maximum retry attempts for the PIN and PUK,
contact your service provider.
Restoring factory settings
Restoring your phone to its factory settings erases all your personal data from
the phone, including your email accounts, system and application settings,
and installed applications.
Back up important data on your phone before you restore factory
settings.
1. On the home screen, touch .
2. Under PERSONAL , touch Backup & reset .
3. Tap Factory data reset > Reset phone .
The phone will restore its factory settings and restart.
Online update
Once in a while, new updates for your phone will be available online. You will
receive a notification when updates are available. Before updating, make sure
that your phone has enough storage space for the update package.
To update manually, on the home screen, touch > About phone > System
Update to check for updates and follow the onscreen instructions to update
your phone online.
All your personal data may be erased during a system update. It is
recommended that you back up important data before updating your
phone.